期刊
APPLIED SCIENCES-BASEL
卷 9, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/app9235022
关键词
perfect absorber; narrowband; grating; mid-infrared
类别
资金
- National Natural Science Foundation of China [60907003, 61671455, 61805278]
- Program for New Century Excellent Talents in University [NCET-12-0142]
- China Postdoctoral Science Foundation [2018M633704]
A subwavelength fine-structured silicon-gold metagrating was designed for realizing mid-infrared (mid-IR) narrowband absorbers. The metagrating consisted of a silicon grating on the stack of a gold film and a quartz substrate. The silicon grating consisted of two periodically arranged silicon strips in each unit cell. The numerical results reveal that perfect absorption of the traverse-magnetic (TM) polarized light at a wavelength of 4.071 mu m can be achieved, with an absorption rate of similar to 99.2% and an absorption full-width at half-maximum (FWHM) bandwidth of similar to 31 nm. Thus, the proposed structure is useful for the spectral control of mid-IR signals. When used as a refractive index sensor, the structure has a measuring range of 1.0-2.0 with a quasi linear response, with a figure of merit (FOM) of similar to 103.
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